Website enhancements

- [x] Convert to Jekyll
- [x] Add Twitter feed
- [x] Add news blog
- [x] Separate pages templates
- [x] News blog design
- [x] Ruboto infrastructure overview
- [x] Post template
- [x] Port old releases to Jekyll
- [x] Community page needs content

This pull request also feature subtle, but significant design enhancements.

@donv, I decided to push the pull request before being finished, so all can see where it is going and eventually leave some feedback.